<template>
    <div class="sidebar">
        <el-menu
            class="sidebar-el-menu"
            :default-active="onRoutes"
            :collapse="collapse"
            background-color="#324157"
            text-color="#bfcbd9"
            active-text-color="#20a0ff"
            unique-opened
            @select="menuHandle"
        >
            <template v-for="item in items">
                <template v-if="item.list && item.list.length">
                    <el-submenu :index="item.index" :key="item.index">
                        <template slot="title">
                            <i :class="item.icon"></i>
                            <span slot="title">{{ item.title }}</span>
                        </template>
                        <template v-for="subItem in item.list">
                            <el-submenu v-if="subItem.list.length" :index="subItem.index" :key="subItem.index">
                                <template slot="title">{{ subItem.title }}</template>
                                <el-menu-item v-for="(threeItem, i) in subItem.list" :key="i" :index="threeItem.index">{{
                                    threeItem.title
                                }}</el-menu-item>
                            </el-submenu>
                            <el-menu-item v-else :index="subItem.index" :key="subItem.index">{{ subItem.title }}</el-menu-item>
                        </template>
                    </el-submenu>
                </template>
                <template v-else>
                    <el-menu-item :index="item.index" :key="item.index">
                        <i :class="item.icon"></i>
                        <span slot="title">{{ item.title }}</span>
                    </el-menu-item>
                </template>
            </template>
        </el-menu>
    </div>
</template>

<script>
import bus from '../common/bus'
export default {
  data () {
    return {
      collapse: false,
      items: JSON.parse(localStorage.getItem('userMenu'))
    }
  },
  computed: {
    onRoutes () {
      return this.$route.path.replace('/', '')
    }
  },
  created () {
    // 通过 Event Bus 进行组件间通信，来折叠侧边栏
    this.items = JSON.parse(localStorage.getItem('userMenu'))
    // console.log('jinru0',localStorage.getItem('userMenu'))
    bus.$on('collapse', (msg) => {
      this.collapse = msg
      bus.$emit('collapse-content', msg)
    })
  },
  methods: {
    menuHandle (index) {
      this.$router.push({ path: `/${index}` })
    }
  }
}
</script>

<style scoped>
.sidebar {
    display: block;
    position: absolute;
    left: 0;
    top: 70px;
    bottom: 0;
    overflow-y: scroll;
}
.sidebar::-webkit-scrollbar {
    width: 0;
}
.sidebar-el-menu:not(.el-menu--collapse) {
    width: 250px;
}
.sidebar > ul {
    height: 100%;
}
</style>
